Panicking Mind

I have a constant recurring worry about my mind and possible damage to it, despite attempting to explain to myself through logic that there could be no possible act I have caused that could have damaged it, which suggests that no matter how small a factor, for example, sleeping on my arm causing my face to be compressed and possible inhibit function of a vein, or the tightness of a collar around my neck, something appears to trigger a deep, sometimes depressing sense of worry. One cause of it I believe is that I am not entirely sure whether compression of a vein during sleep could cause lack of oxygen to the brain or not, and the other factor is likely that my father had similar anxiety. I remember distinctly the occasions he talked of illness and other relatives dying, and I believe it created a deep anxious impression upon me. I also have occasions where I feel I cannot use my mind at all, which often doesn't last long, but I have an underlying fear it could return more seriously. Are these typical signs of hypochondria? What can I do to resolve these problems? It has been the bane of my life...Although at other times, it disappears.